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Submitted on: 09 February 2001.
Revised on: 23 March 2001.
Accepted on: 12 April 2001.
___________________Journal of Sustainable Development of Energy Water and Environment Systems-JSDEWES
Submitted on: 12 November 2007.
Revised on: 18 February 2008.
Accepted on: 19 March 2008.
___________________Journal of Sustainable Development of Energy Water and Environment Systems-JSDEWES
Submitted on: 30 April 2015.
Revised on: 18 June 2015.
Accepted on: 13 August 2015.
___________________Journal of Sustainable Development of Energy Water and Environment Systems-JSDEWES